Comparison

ROT13 Decoder vs StampWorth

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

Head to head
About

ROT13 Decoder

Features
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ROT13 Decoder is a simple yet powerful text encoding/decoding tool that supports ROT13, ROT5, and ROT18 encoding methods. Whether you're performing simple text encryption or need to quickly decode ROT-encrypted content, this app makes it effortless. Key Features: 1. ROT13: Shifts letters by 13 positions 2. ROT5: Shifts numbers by 5 positions 3. ROT18: Shifts both letters and numbers simultaneously Why Choose Us: 1. Completely offline operation for privacy protection 2. Clean and intuitive interface 3. One-click result copying 4. Zero learning curve, ready to use instantly This lightweight yet practical tool puts powerful decoding capabilities right at your fingertips, making ROT-encoded text handling a breeze on your device.

About

StampWorth

Instantly appraise the value of your stamps using AI. Snap a photo to identify stamps, estimate market value, and check live eBay prices. Track your collection's worth over time.

Highlights
  • AI-powered stamp identification
  • Estimated market value
  • Live eBay price checks
  • Condition and rarity grading
  • Scan full album pages (Pro)
  • Track collection worth
  • Manual stamp logging
Features
Read full description

Know what your stamps are really worth. StampWorth turns your phone into an instant stamp appraiser. Snap a photo of any stamp and AI identifies it and estimates its market value in seconds — whether you're a serious collector or you just inherited a box of old stamps and want to know what it's worth. WHY COLLECTORS TRUST STAMPWORTH • Real market valuations — based on condition, rarity and recent sales, not guesswork • Catalog-referenced — cross-checked against the catalogs collectors actually use (Scott, Michel, Stanley Gibbons) • Live eBay prices — see what collectors are paying right now, inside the app • Condition and rarity grading on every stamp KNOW WHAT TO INSURE, SELL, OR KEEP Inherited a collection? Get a clear picture of what everything is worth before you insure it, sell it, or pass it on. StampWorth values each stamp against real market data so you can decide with confidence. SCAN A WHOLE ALBUM AT ONCE Just inherited a binder? Photograph a full album page and StampWorth identifies and values every stamp in a single tap. (PRO) A COLLECTION THAT GROWS IN VALUE Every scan is saved and valued automatically. Track your entire collection and watch your total worth climb — always up to date. ADD RARE FINDS BY HAND Log any stamp manually with full details — free, forever. No AI needed. STAMPWORTH PRO Go unlimited with professional-grade valuations, condition grading, catalog references and live eBay market offers. Try 3 free scans a day, then upgrade to StampWorth Pro for unlimited valuations. Weekly, monthly and yearly plans — cancel anytime. From a lifetime collection to a single lucky find, StampWorth tells you what it's worth. — SUBSCRIPTION & LEGAL StampWorth Pro is an auto-renewable subscription. Payment is charged to your Apple Account at confirmation of purchase. The subscription automatically renews unless it is canceled at least 24 hours before the end of the current period. Your account is charged for renewal within 24 hours prior to the end of the current period. You can manage or cancel your subscription in your App Store account settings after purchase. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://stampworth.web.app/privacy

Screenshots

ROT13 Decoder4 screens
StampWorth4 screens

Verdict

The call

The clearest difference is update cadence: StampWorth at every 2 days against ROT13 Decoder's every 8 months. On price, ads, 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

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

ROT13 Decoder ships an update every 8 months, StampWorth every 2 days. The most recent releases landed on October 13, 2026 and October 14, 2026 respectively.

Scorecard1 real difference · 8 level
ROT13 Decoder versus StampWorth: the parameters behind the verdict, then further details
ParameterROT13 DecoderStampWorth
PriceFreeFree
Rating—2.0 (1 ratings) — better
Number of ratings—1 — better
Update frequencyEvery 8 monthsEvery 2 days — better
AdsNoNo
In-app purchasesNoNo
Monetization—Freemium
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS15.015.0
Further details — not scored
Size16 MB32 MB
Age rating4+4+
Developer佳伟 蔡Tung Tran Thanh

In-app purchases

None

ROT13 Decoder

No in-app purchases

None

StampWorth

No in-app purchases

Questions

Is ROT13 Decoder free?
ROT13 Decoder is free to download, with no in-app purchases.
Is StampWorth free?
StampWorth is free to download, with no in-app purchases.
Do ROT13 Decoder or StampWorth have ads?
Neither ROT13 Decoder nor StampWorth shows ads.
Which is updated more often, ROT13 Decoder or StampWorth?
ROT13 Decoder ships an update every 8 months, and StampWorth every 2 days. Most recently, ROT13 Decoder was updated on October 13, 2026 and StampWorth on October 14, 2026.

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