Comparison

All Universal Unit Converter vs SonLerni

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

Head to head
About

All Universal Unit Converter

This app offers a comprehensive unit conversion tool with a simple interface. It helps users quickly solve homework problems and learn unit conversions across various categories like mass, length, volume, and temperature.

Highlights
  • Mass/weight conversion
  • Length conversion
  • Volume conversion
  • Temperature conversion
  • Time conversion
  • Data size conversion
Read full description

Only one app for all your unit conversions need. A very simple and easy-to-use user interface. This all unit converter tool will help you to convert all units anytime and solve homework problems quickly and easily. Now complete your homework and learn unit conversion while using your phone. make your homework more interesting with this app. Features/Conversions: - Mass/weight (kilograms, pounds, gram etc.) - Length (inche, feet, kilometer, yard etc.) - Volume (liter, mililiter etc.) - Temperature (celsius, fahrenhit, kelvin etc.) - Time (second, minute, hour, day etc.) - Data size (bit, byte, kilobit, kilobyte etc.) More unit conversions and units will be added soon.

About

SonLerni

Improve your listening comprehension in French, Spanish, German, and English with authentic audio and AI-powered explanations. Learn through real conversations and podcasts, with transcripts and study tools to reinforce understanding. Designed for intermediate learners to bridge the gap between reading and understanding native speakers.

Highlights
  • Authentic audio and podcasts
  • AI-powered explanations
  • Transcripts for listening support
  • Vocabulary review tools
  • Adjustable playback speed
  • Focus on real-world comprehension
Features
Read full description

Ready to take your fluency to the next level? SonLerni is for intermediate speakers (A2–B2) who have made some progress in learning a language but lose native speakers at full speed. Level up with native podcasts in English, French, German, Spanish and Hebrew, with synced transcripts, paced playback and phrase-by-phrase replay. TOTAL IMMERSION, NOT TEXTBOOK AUDIO Real conversations at natural speed, full of the slang, idioms and shortcuts textbooks skip. Podcasts let you eavesdrop on natives. SonLerni makes sure you catch what they say. AI TUTOR Lost? Tap the phrase. The AI tutor translates it literally, what the speaker actually means and the nuance: casual, regional or formal. Ask a follow-up, then another. The AI tutor loves rabbit holes. TOO FAST? SLOW IT DOWN • A transcript that follows the audio phrase by phrase • Replay by phrase, not by seconds • Fine-tune the playback speed FLASHCARDS BUILD THEMSELVES Every phrase you ask about becomes a flashcard, with the sentence you heard it in. A few minutes of review a day keeps it. PICK YOUR LEVEL Made for A2–B2. Set your level and get episodes that stretch you without losing you. FIVE LANGUAGES. ONE APP. English, French, German, Spanish and Hebrew. Switch languages any time. SEE YOUR PROGRESS Minutes listened, active days, flashcards and weekly goals, all on one screen. BUILT FOR INTERMEDIATE LEARNERS Outgrown beginner apps? Your next level is native podcasts, explained. SUBSCRIPTION SonLerni Premium is an auto-renewing annual subscription. Payment is charged when you confirm your purchase. The subscription renews automatically unless you turn it off at least 24 hours before the end of the current period. Manage or cancel it any time in your App Store account settings. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://sonlerni.com/privacy

Screenshots

All Universal Unit Converter4 screens
SonLerni4 screens

Verdict

The call

The clearest difference is review sentiment: SonLerni at 100% against All Universal Unit Converter's 0%. SonLerni also leads on price (Free vs $0.99) and update cadence (weekly vs every 38 months). All Universal Unit Converter's advantage is in-app purchases (none vs 2) and ads (none vs shown). On 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

SonLerni is free to download; All Universal Unit Converter costs $0.99 up front. SonLerni sells 1 in-app purchase, starting at $59.99 per year. All Universal Unit Converter asks for nothing beyond the download.

UpkeepUpdate frequency

All Universal Unit Converter ships an update every 38 months, SonLerni weekly. The most recent releases landed on September 24, 2026 and October 24, 2026 respectively.

Scorecard7 real differences · 3 level
All Universal Unit Converter versus SonLerni: the parameters behind the verdict, then further details
ParameterAll Universal Unit ConverterSonLerni
Price$0.99Free — better
Rating—5.0 (10 ratings) — better
Positive reviews0.0% of reviews100.0% of reviews — better
Number of ratings—10 — better
Update frequencyEvery 38 monthsWeekly — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPodiPhone, iPad
Requires iOS13.0 — better17.0
Further details — not scored
Size2 MB81 MB
Age rating4+12+
DeveloperJogani Bhavesh KeshubhaiSonlerni LLC

Customer experience

All Universal Unit Converter

Written reviews2 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

SonLerni

All ratings10 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews8 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

All Universal Unit Converter

No in-app purchases

1 purchases

SonLerni

Subscriptions1
  • Yearly Subscription7 Days trial2 variants$59.991 Year

Questions

Is All Universal Unit Converter free?
All Universal Unit Converter costs $0.99, with no in-app purchases.
Is SonLerni free?
SonLerni is free to download, with in-app purchases available.
Do All Universal Unit Converter or SonLerni have ads?
SonLerni shows ads; All Universal Unit Converter does not.
Which is updated more often, All Universal Unit Converter or SonLerni?
All Universal Unit Converter ships an update every 38 months, and SonLerni weekly. Most recently, All Universal Unit Converter was updated on September 24, 2026 and SonLerni on October 24, 2026.

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