Lightbulb
What Lightbulb is
Lightbulb is a native iOS keyboard extension for generating, polishing, and rewriting text inside other apps. It can turn rough bullets into emails, adjust tone, correct grammar, and translate text. Users can pin frequent replies, outreach scripts, addresses, and hashtags to a keyboard shelf, then set thought reminders and follow-up alerts while typing. Lightbulb says it learns the user’s tone and adapts formatting rules for WhatsApp, LinkedIn, Instagram, and Gmail. Named supported text fields include WhatsApp, Slack, Apple Mail, Gmail, iMessage, Instagram, LinkedIn, X, Threads, Line, and Apple Notes. The extension supports iOS 17 and later on iPhone and iPad; macOS is also listed as a platform. Normal typing is said to remain on the device until an AI action is tapped. The Free plan costs nothing forever, includes basic rewrites, tone shifts, three pinned items, and a 7-day Pro trial. Annual Lightbulb Pro has no listed price.
Who it suits
It suits iPhone and iPad users who want writing assistance directly in app text fields. People needing unlimited AI, templates, reminders, or iCloud sync can consider the listed Pro features.
What it does well
- Rewrites and polishes text in apps
- Supports tone changes, grammar, and translation
- Offers reminders and follow-up alerts
- Free plan includes a 7-day Pro trial
- Normal typing stays on device until AI action
What to know first
- Free shelf limited to three pinned items
- Requires iOS 17 or later
- Full Access is required for network AI
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Lightbulb Free | forever · Basic AI rewrites and tone shifts · Quick-Tap Shelf up to 3 pinned items · 7-day free trial of Pro features | Free |
| Annual Lightbulb Pro | $2.49/mo · billed yearly; page also shows $59.99 before $29.99 · Unlimited in-keyboard AI · All AI tone modes · Unlimited saved pins and templates · iCloud sync across iPhone and iPad · 7-day free trial | $29.99 a year |
As lightbulbai.app lists them, read 12 Oct 2026. The maker's own page has the final word.
Verdict
Lightbulb puts rewriting, translation, saved snippets, and reminders inside an iOS keyboard. The free tier has a three-item shelf limit, while Pro pricing is not provided.
Facts from Lightbulb's own pages
- Brand voice controls
- Yes · lightbulbai.app, 21 Sept 2026
- Data deletion
- The privacy policy says verified deletion requests permanently purge an account and associated personal data within 30 days. · lightbulbai.app, 12 Oct 2026
- Data handling
- The privacy policy says it collects identity, usage, and technical device information and shares personal data only with verified infrastructure providers or as required by law. · lightbulbai.app, 12 Oct 2026
- Device requirement
- The app is a native iOS keyboard extension and supports iOS 17 and above on iPhone and iPad. · lightbulbai.app, 12 Oct 2026
- Follow-up reminders
- Users can set thought reminders and follow-up alerts while typing. · lightbulbai.app, 12 Oct 2026
- Free plan
- Yes · lightbulbai.app, 21 Sept 2026
- Full Access
- The site says iOS requires Full Access for custom keyboards that communicate with AI models over the network and synchronize templates with the main app. · lightbulbai.app, 12 Oct 2026
- Integrations
- The site names WhatsApp, Slack, Apple Mail, Gmail, iMessage, Instagram, LinkedIn, X, Threads, Line, and Apple Notes as supported apps with text fields. · lightbulbai.app, 12 Oct 2026
- Keystroke privacy
- The site says normal typing stays on the device and text is processed only after the user taps an AI action; it says it does not log keystrokes or sell data. · lightbulbai.app, 12 Oct 2026
- Language support
- multilingual · lightbulbai.app, 21 Sept 2026
- Paid subscription
- The terms say certain features require a paid subscription and that in-app purchases and subscriptions are managed through the Apple App Store. · lightbulbai.app, 12 Oct 2026
- Personalization
- Lightbulb says it learns the user's tone and adapts formatting rules for WhatsApp, LinkedIn, Instagram, and Gmail. · lightbulbai.app, 12 Oct 2026
- Saved templates
- Users can pin frequent replies, outreach scripts, addresses, and hashtags to the keyboard shelf for pasting. · lightbulbai.app, 12 Oct 2026
- Support
- The site lists [email protected] for support and says it usually replies within 1 business day. · lightbulbai.app, 12 Oct 2026
- Text assistance
- It can turn rough bullets into polished emails, adjust tone, fix grammar, and translate text. · lightbulbai.app, 12 Oct 2026
- What it does
- Lightbulb is a native iOS keyboard for generating, polishing, and rewriting text inside other apps. · lightbulbai.app, 12 Oct 2026
Where Lightbulb stands on Freedom251
- AI Writing Tools#41 of 269