Semantic search
Search by meaning, not just keywords — describe it the way you remember it.
Private, on-device AI for your files Find anything.
Find anything.
Nothing leaves your device.
Lensum is a file summary and semantic search app with an AI model that runs entirely on your device — your files stay yours.
PDF · Word · Excel · PowerPoint · Photos · Video · Scans
iPhone App Store
In review
The full Lensum experience, in your pocket. Mac
Coming soon
The full Lensum experience, on your desk. On-device AI model Unlimited AI usage No account required Nothing uploaded 12 interface languages
Everything in your files, one search away
Search, summarize and understand your files — with an AI model that never leaves your device.
Unlimited summaries
Turn any file — long or short — into a clear, structured summary.
AI Summary
On-device AI model
A local model reads your files on your device — nothing is uploaded, and no one else can see them.
Images & videos
Photos are searchable by what they show — remember a scene and find the file; text inside images is picked up too. Videos are understood from sampled frames, so a remembered scene finds the clip.
Every format that matters
PDFs, documents, images and more — indexed in one place.
PDFDOCXPNGXLSX+12
Private by design
No account, no analytics SDK, no data sale. Privacy is the product.
No network calls
No third-party SDKs
iPhone
Made for iPhone
Same on-device engine, native iOS experience.
iPhone Duo
Ready for iPhone Duo.
Lensum is adapted for iPhone Duo: the cover screen and the inner screen each get their own layout. On the wider inner screen, the tabs move into a vertical column. It works half-open, too.
macOS
Built for Mac
The same library, at home on your Mac — search, summaries, tags and the files overview in one window.
Your files never leave your device
The summary engine and the search index live on your device. Lensum has no account system — there is simply nothing to hand over.
✓ On-device model
AI runs where your files are
Summaries are generated by a model on your device. Nothing is sent to any AI provider.
✓ Zero accounts
No sign-up, ever
No account system means no profile to build and no data to breach.
✓ Nothing uploaded
Delete means deleted
Delete a file from Lensum, and its record and index go with it.
Frequently asked questions
What is Lensum?
Lensum is a file summary and semantic search app for iPhone and Mac. It reads your files with an on-device AI model so you can find anything by meaning and get clear summaries.
Is my data private?
Yes. Files, extracted text, summaries and the search index are processed and stored entirely on your device. Nothing is uploaded — Lensum has no account system, no servers, and no third-party analytics SDK.
When is the Mac version coming?
The Mac app is in development. Join the waitlist at the top of this page and we will email you the moment it ships.
Which languages does Lensum support?
The app UI ships in 12 languages at launch. Semantic search works across the languages your files use.
How much does it cost?
Pricing will be announced at launch. One purchase covers both iPhone and Mac, with the same benefits and pricing. Purchases are handled entirely by Apple through the App Store.
Is there a usage limit?
No. Summaries and semantic search run on your device — no quota, no per-use charge.