Comparison

Luu Memory vs Gravity

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Luu Memory

Securely encrypt and store your private messages, ensuring they remain inaccessible to third parties. Schedule messages to be sent to the future and grant trusted individuals permission to manage delivery.

Highlights
  • Message encryption
  • Future message delivery
  • Permission-based sharing
  • Secure storage
  • Long-term message scheduling
Features
Read full description

Luu Memory - Last time you unfold. Encrypt your secrets, they will be encrypted stay out of all third party's hand, including us! Additional features: - Send the secrets to the future - Luu makes it possible for you to send a message to tens or even hundred years in the future - Make sure your secrets can't never be send to the wrong person - By givings your trusted ones the permission to decide whether to send package to receiver or not, you can ensure that your package will landed on the right hands ( in the event that the receiver is compromised and you're no longer available to make the judgement )

About

Gravity

This app offers a streamlined note-taking experience by eliminating folders and tags, focusing on a single, continuous stream of thoughts. Capture ideas instantly and use simple gestures to manage your notes, prioritizing what matters most.

Highlights
  • Instant note capture
  • Single stream organization
  • Swipe gestures for actions
  • Attention-based prioritization
  • Private iCloud sync
  • Lightweight prefixes for filtering
  • Fast search functionality
Features
Read full description

Gravity keeps all your notes in one stream, with the newest at the top. As you add more, older notes sink down the list. When one of them still matters, swipe it right and it comes back to the top. The idea comes from Andrej Karpathy's append-and-review note: write everything in one place, read back through it now and then, and move up whatever you still care about. Gravity has no folders, so there's nothing to file. Writing The cursor is waiting at the top when you open the app. Type your note and press Return twice, or tap the add button. A half-written draft stays where you left it. Rescuing and tidying Swipe right on a note to rescue it. Swipe left to archive, delete, share or copy. Archived notes have a page of their own, and deleted notes stay in Deleted Notes until you restore them or clear them out. Markdown and checklists Headings, bold, italics, lists, links and quotes show formatted in the stream. Start a line with "- [ ]" to make a checklist, then tick items off without opening the note. In the editor the formatting appears as you type, and a small bar above the keyboard adds headings, bold, lists and checklists. Everything is saved as plain Markdown text. Tags Start a note with todo:, idea:, read: or any word followed by a colon, and it gets a colour of its own. Type todo: into search to see only those notes. There's no tag manager to look after. Search Search covers every note on your phone, archived ones too, and works offline. It matches parts of words and ignores accents. Getting notes in The Home Screen widget starts a new note or pastes in whatever you last copied. You can also share text or a link from another app, and it becomes a new note at the top of the stream. Privacy Your notes are stored on your iPhone. Gravity has no accounts and no analytics, and it doesn't collect any data. If you want your notes on your other Apple devices, turn on iCloud sync; it also works with Gravity for Mac, which is sold separately. You can export everything as JSON or Markdown at any time. Looks Choose light, dark or OLED black, or follow the system, and pick from three text sizes. There's a stats page too, worked out on your phone, of course. Price You pay once. There's no subscription, no in-app purchases and no ads. Privacy policy: https://www.gravitynotes.app/privacy-policy

Screenshots

Luu Memory4 screens
Gravity4 screens

Verdict

The call

The clearest difference is price: Luu Memory at Free against Gravity's $9.99. Luu Memory also leads on review sentiment (100% vs 92%) and iOS requirement (14 vs 17.0). Gravity's advantage is ads (none vs shown). On update cadence, in-app purchases and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Luu Memory is free to download; Gravity costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Luu Memory ships an update every 4 weeks, Gravity fortnightly. The most recent releases landed on October 7, 2026 and October 2, 2026 respectively.

Scorecard5 real differences · 5 level
Luu Memory versus Gravity: the parameters behind the verdict, then further details
ParameterLuu MemoryGravity
PriceFree — better$9.99
Rating—5.0 (9 ratings) — better
Positive reviews100.0% of reviews — better91.7% of reviews
Number of ratings—9 — better
Update frequencyEvery 4 weeksFortnightly — better
AdsYesNo — better
In-app purchasesNoNo
MonetizationAd-supported — betterPaid
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS14 — better17.0
Further details — not scored
Size27 MB36 MB
Age rating4+4+
DeveloperAn DoTristan Manchester

Customer experience

Luu Memory

Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Gravity

All ratings9 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews12 reviews
Positive91.7%
Neutral0.0%
Negative8.3%

In-app purchases

None

Luu Memory

No in-app purchases

None

Gravity

No in-app purchases

Questions

Is Luu Memory free?
Luu Memory is free to download, with no in-app purchases.
Is Gravity free?
Gravity costs $9.99, with no in-app purchases.
Do Luu Memory or Gravity have ads?
Luu Memory shows ads; Gravity does not.
Which is updated more often, Luu Memory or Gravity?
Luu Memory ships an update every 4 weeks, and Gravity fortnightly. Most recently, Luu Memory was updated on October 7, 2026 and Gravity on October 2, 2026.

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