Comparison

Lettie vs Gravity by Code Academy

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

Head to head
About

Lettie

Connect with people worldwide through a unique pen pal experience. Write letters that travel across the globe, with delivery times based on distance. Discover new friends, translate messages, and collect virtual stamps from different countries.

Highlights
  • Letters travel based on real-world distance
  • Discover and connect with new pen pals
  • In-app translation for over 70 languages
  • Customizable pixel character profiles
  • Collect virtual stamps from visited countries
  • Turn-based letter writing to encourage thoughtful replies
Features
Read full description

Lettie is a pen-pal app where letters fly across a globe. You write a letter tonight. It takes off, crosses the globe for as long as the distance between your two countries, and lands tomorrow. Seoul to Tokyo takes a few hours; Seoul to New York, most of a day. Nothing is instant, so people write like it matters. ■ Letters travel real distance Delivery time is set by the distance between your country and your pen pal's: at least an hour, at most a day. You can watch your envelope move across the globe, and you get a nudge when it is about to land. ■ Pick up a stranger's letter In Discover, people release letters into the sky. Three new envelopes drift close every day. Open one, read it, and write back if it moves you. That is how most friendships on Lettie begin. ■ Translation in a tap, 70+ languages Every letter has a translate button: tap it and the letter turns into your language, tap again for the original. A few translations a day are free, and Lettie Plus makes them unlimited. Language is not a barrier here; distance is the fun part. ■ Show up as a character, not a selfie Everyone starts as one of sixteen pixel characters, or turns a selfie or a few words into their own character in the same style. The first one is free, and the photo is only used for the drawing, never stored. There are no profile photos. The first thing anyone learns about you is how you write. ■ Lettie Passport — a stamp for every country Exchange five or more letters with people from a country (at least two each way) and its stamp lands in your passport, along with that country's postage stamp for your album. Collect stamps to earn titles like “World Pen Pal”, which show next to your name on your letters and profile. ■ Letters take turns You can write to the same person again only after their reply lands. That one rule keeps conversations calm and honest. If three days pass after your letter arrives with no reply, you can send one more. ■ Someone to meet today A few cards a day, chosen by interests and the kind of people you want to meet. No swiping, no scores. Skip freely. Good for you if · You want pen pals and friends abroad · You are learning a language and want real letters, not drills · You are tired of instant messages that go nowhere · You like the feeling of waiting for a reply Free to download, and your first custom character is free too. Optional gems unlock stamp draws and more characters, and Lettie Plus lets you write without waiting and translate without limits. Reporting and blocking are built in. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://lettie.co.kr/privacy

About

Gravity by Code Academy

Features
Read full description

Gravity is Azerbaijan’s community-driven social and educational benefit platform built. Code Academy. Its main purpose is to unite students, alumni, enthusiasts, instructors, and staff in one connected space. Designed as the official community app of Code Academy, Gravity keeps everyone who’s ever been part of our journey in touch, informed, and involved. Whether you're currently learning, mentoring, teaching, or part of our alumni network, Gravity helps you stay engaged, not just with content, but also with people. •Stay Informed – Follow global tech news, academy-wide updates, and upcoming events - all in one feed. •Join the Conversation – Ask questions, exchange ideas, and participate in community-wide discussions. •Grow Your Network – Connect with alumni, peers, and professionals across various fields. •Explore Opportunities – Get early access to workshops, hackathons, bootcamps and career-building events. Gravity is more than an app - it’s the center of Code Academy’s growing ecosystem. Proudly developed as the first community app of its kind in Azerbaijan. Complete your profile, get involved, and be part of a future-focused tech community that grows stronger together.

Screenshots

Lettie4 screens
Gravity by Code Academy4 screens

Verdict

The call

The clearest difference is in-app purchases: Gravity by Code Academy at none against Lettie's 8. Gravity by Code Academy also leads on ads (none vs shown). Lettie's advantage is update cadence (daily vs fortnightly). On price, device support and iOS requirement 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

Both are free to download. Lettie sells 8 in-app purchases, starting at $6.99 per month. Gravity by Code Academy asks for nothing beyond the download.

UpkeepUpdate frequency

Lettie ships an update daily, Gravity by Code Academy fortnightly. The most recent releases landed on November 6, 2026 and October 30, 2026 respectively.

Scorecard3 real differences · 7 level
Lettie versus Gravity by Code Academy: the parameters behind the verdict, then further details
ParameterLettieGravity by Code Academy
PriceFreeFree
Rating5.0 (1 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings1 — better—
Update frequencyDaily — betterFortnightly
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.0 — better15.1
Further details — not scored
Size112 MB79 MB
Age rating17+17+
Developerjunhyeong kimCODE LLC

In-app purchases

8 purchases

Lettie

Subscriptions2
  • Lettie Plus Monthly$6.991 Month
  • Lettie Plus Yearly$49.991 Year
One-time6
  • 30-gem$1.99
  • 60-gem$3.99
  • 100-gem$5.99
Show 3 more
  • 200-gem$11.99
  • 500-gem$24.99
  • Lettie Plus Lifetime$59.99
None

Gravity by Code Academy

No in-app purchases

Questions

Is Lettie free?
Lettie is free to download, with in-app purchases available.
Is Gravity by Code Academy free?
Gravity by Code Academy is free to download, with no in-app purchases.
Do Lettie or Gravity by Code Academy have ads?
Lettie shows ads; Gravity by Code Academy does not.
Which is updated more often, Lettie or Gravity by Code Academy?
Lettie ships an update daily, and Gravity by Code Academy fortnightly. Most recently, Lettie was updated on November 6, 2026 and Gravity by Code Academy on October 30, 2026.

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