AI

AI spelling and grammar checker for docs

Hacker News

AI spelling and grammar checker for docs

Hey HN! Spellcaster is a Python-based CLI tool for running spelling and grammar checks across documentation files. LLMs are great proofreaders, and while rule-based spellcheckers exist, we noticed there wasn’t a good CLI tool that leveraged AI agents. So we built one! Spellcaster came together over a weekend at the Mintlify AI DevTools hackathon in San Francisco[0], where it won the Best Demo Award. We ran Spellcaster against several large open source projects and identified hundreds of readability issues in their docs. Some popular ones: * Cursor: 116 errors * Mintlify 245 * Vercel: 1053 (My favorite was Vercel spelling "Lorem ipsum" wrong in one of their pages). Spellcaster uses LiteLLM for easy model swapping and AgentOps for cost and error tracking. [0] https://x.com/AlexReibman/status/1834524984183767276

Share card

Actual performance

3points
Did not reach leaderboard

Launch Intel predictions

Analyze your own launch →
Product HuntOn track for Day 1 leaderboard · Strong signals: agents, agent, cursor · Missing: mac, macos, claude
82%82% predicted probability of success on Product Hunt, based on ML models trained on real launch data.
best fitHighest predicted score across all platforms for this description.
Indie HackersFits the IH revenue-focused audience · Missing: supports, reddit linkedin, podcasting
60%60% predicted probability of success on Indie Hackers, based on ML models trained on real launch data.
Hacker NewsStrong engagement from HN community · Strong signals: exist, open source, ide · Missing: https docs, excited, just released
52%52% predicted probability of success on Hacker News, based on ML models trained on real launch data.
nativeThis product was originally launched on this platform.
TrustMRRLess likely to generate early MRR · Missing: mobile apps, ios, personal
48%48% predicted probability of success on TrustMRR, based on ML models trained on real launch data.
AppSumoMay struggle as an AppSumo deal · Missing: plus, platform, intuitive
30%30% predicted probability of success on AppSumo, based on ML models trained on real launch data.
Acquire.comPre-revenue stage for this audience · Missing: arr, mrr, revenue
16%16% predicted probability of success on Acquire.com, based on ML models trained on real launch data.
BetaListMay not resonate with beta-testers · Missing: web3, chat, crypto
1%1% predicted probability of success on BetaList, based on ML models trained on real launch data.

Incorrect prediction on native model

Similar products

AI
AI grammar checker27%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

AI grammar checker

Hacker News15
Agrammar
Agrammar61%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

AI proofreader and grammar checker

Indie Hackerscommitment-side-project
A
A Private Grammar Checker37%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

A Private Grammar Checker

Hacker News1
SpellChecking
SpellChecking7%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

Free Grammar Checker tool

Product Hunt+6
Sothik: Bengali Spell & Grammar Checker
Sothik: Bengali Spell & Grammar Checker36%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

Grammarly Alternative for Bengali

Product Hunt+12
Sp
Spellling and Grammar Checker for Figma31%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

Spellling and Grammar Checker for Figma

Hacker News2
Fr
Free Web-Based Spelling and Grammar Checker46%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

Free Web-Based Spelling and Grammar Checker

Hacker News4
AI
AI Japanese grammar checker for Chrome33%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

AI Japanese grammar checker for Chrome

Hacker News1
Free plagiarism checker
Free plagiarism checker12%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

Your full writing assistance. plagiarism checker, grammar

Product Hunt+1
Trinka's Spanish Grammar Checker
Trinka's Spanish Grammar Checker19%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

Improve Your Writing with Free AI Spanish Grammar Checker

Product Hunt+3