# StackKit

> StackKit is an independent, hand-checked directory of 50 tools for writers growing a newsletter on Substack (free and paid subscribers). Each tool has its real URL, pricing checked on 2026-10-18, who it's best for, and a short honest verdict. Not affiliated with Substack Inc.

Monetization: labeled sponsored placements, paid fast-track review, and affiliate links for some tools. Verdicts are not for sale.

## Key pages
- [Directory](https://stackkit.ink/): searchable list of all tools
- [Best tools to grow your Substack in 2026](https://stackkit.ink/guides/best-tools-to-grow-your-substack-2026/): long-form guide with starter stacks by budget
- [About & disclosures](https://stackkit.ink/about/)
- [Feature your tool](https://stackkit.ink/feature/): sponsorship options
- [Raw data (JSON)](https://stackkit.ink/data/tools.json)

## Growth & Notes
Referral networks, recommendation swaps, signup embeds and Substack Notes tools that bring in new subscribers.
- [Narrareach](https://stackkit.ink/tools/narrareach/) (https://www.narrareach.com/): Turning long-form posts into Notes and cross-posting to LinkedIn, X, Bluesky, Threads and Medium. Pricing: From $19.99/mo ($199/yr); higher tiers $39/mo and $89/mo (discounted yearly). Verdict: Good if distribution beyond Substack is your bottleneck. Hands Notes to Substack's native scheduler rather than posting from a stored session.
- [SparkLoop](https://stackkit.ink/tools/sparkloop/) (https://sparkloop.app/): Getting paid recommendations and buying cross-newsletter referrals. Pricing: Free to join the Partner Network and Upscribe recommendation widget (SparkLoop takes a share of paid-recommendation earnings). Paying other newsletters to recommend you is a separate paid program. Verdict: The best-known newsletter recommendation network. Earning from recommendations is low-risk; paying for referrals only makes sense once you know what a subscriber is worth to you.
- [StackSweller](https://stackkit.ink/tools/stacksweller/) (https://stacksweller.com/): A simple cloud queue for batch-scheduling Substack Notes. Pricing: Pro $39/mo, or $25/mo billed yearly ($250/yr). Verdict: Does one job (a Notes queue that runs with your laptop closed). Be aware it works by holding your Substack session, and Substack now schedules single Notes natively.
- [Supascribe](https://stackkit.ink/tools/supascribe/) (https://supascribe.com/): Writers with their own website who want on-brand Substack signup forms, popups and landing pages. Pricing: Free for your first 100 subscribers captured and 1,000 embed views; a paid Pro plan after that (usage add-ons beyond plan limits). Verdict: Fills a real gap: Substack's native embed is fixed-width and unstyled. Independent (not affiliated with Substack), and only useful if you drive traffic from a site you control.
- [WriteStack](https://stackkit.ink/tools/writestack/) (https://www.writestack.io/): Writers who live on Substack Notes and want batch scheduling, research and Notes-to-subscriber analytics. Pricing: Hobbyist $23.99/mo, Standard $32.99/mo, Enterprise $99.99/mo; 7-day free trial. Verdict: The most complete Substack-only Notes suite. Pricey for a beginner, and publishing runs through a Chromium browser extension acting in your logged-in session.

## Analytics
See which posts, Notes and channels actually turn readers into free and paid subscribers.
- [Bitly](https://stackkit.ink/tools/bitly/) (https://bitly.com/): Tracking clicks on links you share to social, podcasts and print. Pricing: Free (with ads); Core $10/mo (annual only); Growth $29/mo; Premium $199/mo (annual pricing). Verdict: Handy for knowing which channel sends readers. The free tier is limited; many writers can get by with UTM tags plus Google Analytics.
- [Byline OS](https://stackkit.ink/tools/byline-os/) (https://bylineos.com/): Paid-newsletter writers who want MRR, churn, cohort and revenue-per-post analytics. Pricing: Starter free (CSV import, 30-day retention); Growth $19/mo; Scale $49/mo. 14-day trial. Currently in private beta. Verdict: Promising revenue-first analytics built specifically for Substack. It is a beta product; live sync uses your Substack session cookie and undocumented internal APIs, so the CSV-upload mode is the safer start.
- [Google Analytics](https://stackkit.ink/tools/google-analytics/) (https://analytics.google.com/): Seeing where your Substack traffic comes from (Substack lets you add a GA measurement ID). Pricing: Free. Verdict: Free and worth connecting on day one for referral sources. Overkill for most writers beyond the acquisition reports.
- [Plausible](https://stackkit.ink/tools/plausible/) (https://plausible.io/): Privacy-friendly analytics for your own website or landing page. Pricing: From $9/mo (Starter, 10k monthly pageviews); Growth $14/mo; Business $19/mo. Free trial. Verdict: Excellent lightweight analytics, but you can't install it on a substack.com publication. Use it on a personal site that funnels readers to Substack.
- [Subshack](https://stackkit.ink/tools/subshack/) (https://www.subshack.pro/): Finding out which Notes and posts actually bring subscribers, and auditing your profile. Pricing: Free (Subshack 1.0), including a no-signup public profile audit. Verdict: A free, measurement-first browser extension that never posts for you. New and small, so expect rough edges.

## Cross-posting & Social
Schedule and repurpose your writing for X, LinkedIn, Threads, Bluesky and Notes.
- [Buffer](https://stackkit.ink/tools/buffer/) (https://buffer.com/): Scheduling Notes alongside every other social channel from one calendar. Pricing: Free (up to 3 channels); Essentials $5/channel/mo billed yearly ($6 monthly). Verdict: Reliable and affordable, and its free plan includes Substack Notes scheduling. The best default if you post to several networks.
- [Hypefury](https://stackkit.ink/tools/hypefury/) (https://hypefury.com/): Automating evergreen reposts and growth on X. Pricing: From $6/mo (1 channel) to $19/mo (all channels); 7-day free trial. Verdict: Strong automation for X-heavy writers. Less relevant if X isn't where your readers are.
- [Repurpose.io](https://stackkit.ink/tools/repurpose-io/) (https://repurpose.io/): Automatically distributing video and podcast clips across platforms. Pricing: Starter $35/mo; Pro $79/mo; Agency $179/mo (cheaper yearly); 14-day free trial. Verdict: Saves real time if you make video or audio. Pure text writers don't need it.
- [Taplio](https://stackkit.ink/tools/taplio/) (https://taplio.com/): Writers growing a professional audience on LinkedIn. Pricing: Starter $39/mo; Growth $69/mo; Pro $199/mo; 7-day free trial. Verdict: Effective for LinkedIn but expensive. Only worth it if LinkedIn is a primary acquisition channel.
- [Typefully](https://stackkit.ink/tools/typefully/) (https://typefully.com/): X-first writers who also want to post to LinkedIn, Threads, Bluesky and Substack Notes. Pricing: Free (10 posts/mo); Creator $99/yr; Business $20 per social set/mo. Verdict: A polished writing-first scheduler with Substack Notes support. The free plan is enough to test it.

## Design
Header images, social cards and brand visuals without hiring a designer.
- [Canva](https://stackkit.ink/tools/canva/) (https://www.canva.com/): Header images, social graphics, Notes images and simple brand kits. Pricing: Free; Pro US$144/yr for one person (before tax). Verdict: The default design tool for newsletter writers. The free plan covers most needs.
- [Figma](https://stackkit.ink/tools/figma/) (https://www.figma.com/): Custom visual systems, templates and detailed design work. Pricing: Free Starter; Professional full seat $16/mo. Verdict: More power than most writers need. Pick it if you already know it or want pixel-level control.
- [Kittl](https://stackkit.ink/tools/kittl/) (https://www.kittl.com/): Typography-heavy graphics and AI-assisted illustrations. Pricing: Free plan; paid Pro, Expert and Max plans (see pricing page). Verdict: A stylish Canva alternative with great type tools. The free plan is for personal use only.
- [remove.bg](https://stackkit.ink/tools/remove-bg/) (https://www.remove.bg/): One-click background removal for headshots and product images. Pricing: Free to try; paid plans for full-resolution output (see pricing page). Verdict: Fast and accurate. Now a Canva brand, and Canva Pro includes a background remover, so you may not need both.
- [Unsplash](https://stackkit.ink/tools/unsplash/) (https://unsplash.com/): Free, high-quality photos for post headers. Pricing: Free to use under the Unsplash License. Verdict: The go-to free photo library. Popular images show up everywhere, so crop or edit them to stand out.

## Editing & Proofreading
Catch typos, tighten sentences and keep your voice.
- [Grammarly](https://stackkit.ink/tools/grammarly/) (https://www.grammarly.com/): Catching typos and clarity issues everywhere you write, including the Substack editor. Pricing: Free; Pro from $12/mo. Verdict: The free browser extension is worth installing. Pro's rewrites can flatten your voice, so accept suggestions selectively.
- [Hemingway Editor](https://stackkit.ink/tools/hemingway-editor/) (https://hemingwayapp.com/): Making dense posts easier to read. Pricing: Free web editor; Editor Plus from $8.33/mo billed annually ($100/yr). Verdict: The free web version does the core job (highlighting long and passive sentences). Most writers don't need Plus.
- [LanguageTool](https://stackkit.ink/tools/languagetool/) (https://languagetool.org/): Multilingual writers and anyone who wants a Grammarly alternative. Pricing: Free; Premium $24.90/mo monthly or $69.90/yr. Verdict: Strong grammar checking across many languages, and much cheaper per year than monthly billing.
- [ProWritingAid](https://stackkit.ink/tools/prowritingaid/) (https://prowritingaid.com/): Deep style reports for long-form and fiction writers. Pricing: Free; Premium $10/mo billed yearly ($120) or $30/mo monthly. Verdict: More thorough reports than Grammarly. Worth trying if you write long essays or serialized fiction.
- [QuillBot](https://stackkit.ink/tools/quillbot/) (https://quillbot.com/): Paraphrasing, summarizing and quick rewrites. Pricing: Free; Premium $19.95/mo or $99.95/yr. Verdict: Useful for tightening a stubborn paragraph. Don't lean on it for whole posts, because readers subscribe for your voice.

## Planning, Research & Automation
Editorial calendars, idea capture, research and automations.
- [Google Trends](https://stackkit.ink/tools/google-trends/) (https://trends.google.com/): Checking whether a topic is rising before you write about it. Pricing: Free. Verdict: A quick, free sanity check for timely topics and post titles.
- [Notion](https://stackkit.ink/tools/notion/) (https://www.notion.com/): Editorial calendars, idea banks and sponsor CRMs. Pricing: Free; Plus $10/seat/mo. Verdict: The most flexible planning hub for newsletter writers. The free plan covers solo use.
- [Obsidian](https://stackkit.ink/tools/obsidian/) (https://obsidian.md/): Building a personal knowledge base of notes, quotes and ideas. Pricing: Free; optional Sync $4/mo and Publish $8/mo (billed annually). Verdict: Great for writers who think in linked notes. Your files stay local in Markdown.
- [Readwise](https://stackkit.ink/tools/readwise/) (https://readwise.io/): Collecting highlights from books and articles to feed your writing. Pricing: Readwise Full $9.99/mo billed annually ($12.99 monthly); Lite $5.59/mo billed annually. Verdict: A strong research engine for essayists and curators. Its Reader app is included with Full.
- [Trello](https://stackkit.ink/tools/trello/) (https://trello.com/): A simple kanban for drafts moving from idea to published. Pricing: Free (up to 10 collaborators); Standard $5/user/mo billed annually. Verdict: Simpler than Notion if you only need a board. Free is plenty for one writer.
- [Zapier](https://stackkit.ink/tools/zapier/) (https://zapier.com/): Automating busywork such as logging new posts to a spreadsheet or sending sponsor reminders. Pricing: Free; Professional from $19.99/mo. Verdict: Powerful glue between apps. Substack has no official public API, so automations usually start from its RSS feed or email.

## AI Writing & Research
AI assistants for brainstorming, outlining, critique and research. Use with care.
- [ChatGPT](https://stackkit.ink/tools/chatgpt/) (https://chatgpt.com/): Brainstorming angles, outlines, headlines and research summaries. Pricing: Free; Plus $20/mo. Verdict: A versatile thinking partner. Use it for ideas and edits rather than finished prose your readers will recognize as generic.
- [Claude](https://stackkit.ink/tools/claude/) (https://claude.ai/): Long-document feedback, structural edits and drafting help. Pricing: Free; Pro $20/mo or $17/mo billed annually. Verdict: Particularly good at critiquing long drafts. The same caution about voice applies.
- [Perplexity](https://stackkit.ink/tools/perplexity/) (https://www.perplexity.ai/): Quick research with cited sources. Pricing: Free; Pro $20/mo. Verdict: Faster than a search engine for background research. Always click through and verify the citations.
- [Sudowrite](https://stackkit.ink/tools/sudowrite/) (https://sudowrite.com/): Fiction writers publishing serialized stories. Pricing: Hobby & Student $10/mo; Professional $22/mo; Max $44/mo; free trial. Verdict: Purpose-built for fiction. Not the right tool for essays or news-style newsletters.

## Audio, Podcast & Video
Record, edit and repurpose audio and video for Substack podcasts and social clips.
- [Adobe Podcast](https://stackkit.ink/tools/adobe-podcast/) (https://podcast.adobe.com/): Making laptop-mic recordings sound clean (Enhance Speech). Pricing: Free tier; premium features require a paid Adobe plan (check site for current offer). Verdict: Enhance Speech is impressive on the free tier. Check Adobe's current plans before relying on premium features.
- [Audacity](https://stackkit.ink/tools/audacity/) (https://www.audacityteam.org/): Recording and cleaning up voiceovers on a zero budget. Pricing: Free and open source. Verdict: Dated interface but free and capable for simple narration edits.
- [Descript](https://stackkit.ink/tools/descript/) (https://www.descript.com/): Editing podcast and video by editing the transcript. Pricing: Free; Hobbyist $16/mo billed annually ($24 monthly); Creator $24/mo annually ($35 monthly). Verdict: The easiest way for writers to edit audio and video. A natural fit for Substack podcasts.
- [ElevenLabs](https://stackkit.ink/tools/elevenlabs/) (https://elevenlabs.io/): Producing audio versions of posts with natural-sounding AI voices. Pricing: Free (10k credits/mo); Starter $6/mo; Creator $22/mo; higher tiers available. Verdict: Best-in-class AI voice. Tell listeners when a voice is synthetic.
- [OpusClip](https://stackkit.ink/tools/opusclip/) (https://www.opus.pro/): Turning long videos or podcast episodes into short social clips. Pricing: Free (60 credits/mo); Starter $15/mo; Pro $14.50/mo billed annually. Verdict: Fast way to get shorts from long recordings. Review the AI's clip choices before posting.
- [Riverside](https://stackkit.ink/tools/riverside/) (https://riverside.com/): Recording remote interviews in high quality. Pricing: Free; Pro $24/mo billed annually ($288/yr). Verdict: Records each guest locally, so remote interviews sound studio-grade. Ideal for interview-driven newsletters.

## Embeds & Interactive
Forms, charts and link pages that add interactivity around your newsletter.
- [Datawrapper](https://stackkit.ink/tools/datawrapper/) (https://www.datawrapper.de/): Clean, accurate charts, maps and tables for data-driven posts. Pricing: Free; Pro $21/user/mo; Business $39/user/mo. Verdict: Newsroom-quality charts for free. In Substack, the reliable route is exporting a PNG and linking to the interactive version.
- [Flourish](https://stackkit.ink/tools/flourish/) (https://flourish.studio/): Animated and interactive charts and scrollytelling. Pricing: Free (public publishing with attribution); paid Presenter (via Canva Business) and Publisher/Enterprise plans on contract. Verdict: More dramatic visuals than Datawrapper. Same Substack caveat: plan on a static image plus a link.
- [Linktree](https://stackkit.ink/tools/linktree/) (https://linktr.ee/): A link-in-bio page that points social followers to your Substack. Pricing: Free; Starter $6/mo annually ($8 monthly); Pro $12/mo; Premium $30/mo. Verdict: Fine for bios, but your Substack homepage can often serve as the link. Only pay if you need the analytics.
- [Tally](https://stackkit.ink/tools/tally/) (https://tally.so/): Reader surveys, sponsor inquiry forms and feedback forms. Pricing: Free (unlimited forms and submissions); Pro $24/mo; Business $74/mo. Verdict: The most generous free form builder. Substack posts can't host forms directly, so link to it from your post or About page.

## Sponsorships & Monetization
Sponsor marketplaces, digital product sales and tips beyond paid subscriptions.
- [Gumroad](https://stackkit.ink/tools/gumroad/) (https://gumroad.com/): Selling ebooks, templates and guides alongside your newsletter. Pricing: No monthly fee; 10% + $0.50 per transaction on direct sales. Verdict: The simplest way to sell a digital product to your readers. Fees are high per sale but there's no fixed cost.
- [Hecto](https://stackkit.ink/tools/hecto/) (https://www.hecto.io/): Selling sponsorship slots with transparent, upfront prices. Pricing: Marketplace; creators list ad packages with upfront prices (platform pricing on its site). Verdict: A straightforward sponsorship marketplace. Listing is easy, but demand varies by niche.
- [Ko-fi](https://stackkit.ink/tools/ko-fi/) (https://ko-fi.com/): One-off tips from readers who won't commit to a paid subscription. Pricing: Free with a 5% platform fee on some features; Ko-fi Gold $12/mo for 0% platform fee. Verdict: A low-friction tip jar that complements paid subscriptions.
- [Paved](https://stackkit.ink/tools/paved/) (https://www.paved.com/): Established newsletters looking for sponsor demand. Pricing: Not publicly listed for publishers (advertiser budgets from under $1,000). Verdict: A large newsletter ad network. Advertisers want audience size and data, so it suits writers with a sizable list.
- [Swapstack](https://stackkit.ink/tools/swapstack/) (https://www.swapstack.co/): Finding sponsors and affiliate deals for small and mid-sized newsletters. Pricing: Pricing not listed on the homepage. Verdict: One of the original newsletter sponsorship marketplaces. Worth a free signup to see what deals match your niche.