Comparison

Owll vs GTP API Gravity Calculator2

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

Head to head
About

Owll

This app automatically records, transcribes, and summarizes audio from meetings, lectures, and online videos. It offers AI-powered note-taking, organization, and sharing features, syncing seamlessly across multiple Apple devices and the web.

Highlights
  • AI-powered recording and transcription
  • Automatic meeting summaries and to-dos
  • Real-time transcription for online meetings
  • Seamless sync across Apple devices and web
  • Multilingual transcription and translation
  • AI study aid with flashcards and quizzes
  • Import audio from apps and YouTube videos
Features
Read full description

Record, transcribe and summarize anything — meetings, voice notes, lectures, and sermons — with one tap on Apple Watch, iPhone, iPad or Website - Owll AI. Owll is your AI note taker, voice recorder, and second brain. Capture voice notes from meetings, lectures, sermons, interviews, and calls — then get AI meeting summaries, timestamped transcripts, and smart action items. Record audio, upload files, or capture online calls from Zoom, Google Meet, and Microsoft Teams for fast audio transcription — then organize, highlight, and share notes. Use Owll as your reliable meeting recorder, speech-to-text tool, dictation app, or study partner — perfect for work, school, or personal productivity. All your notes sync across Apple Watch, iPhone, iPad, and the Web for a seamless workflow. KEY FEATURES — Seamless Sync: Apple Watch, iPhone, iPad & Web Tap once on your Apple Watch to record voice notes. Full AI transcripts and meeting notes sync across iPhone, iPad, and Web. — AI-Powered Recording, Summaries & To-Dos Record with one tap using Owll's AI note taker and built-in AI Coach. Supports voice recorder mode, speech-to-text, voice transcription, interview recording, and audio file imports — then generates concise meeting summaries and to-do lists. — AI Contact Manager for Sales & Client Notes Scan business cards to capture leads instantly. Record sales calls with auto summaries and follow-ups. Search customer notes, track deals, and close more sales faster. — Transcription for Online Meetings Owll transcribes Zoom, Google Meet, and Microsoft Teams sessions with timestamps and clear formatting. Searchable meeting notes help you stay focused. — Faith & Sermon Notes Capture every word of the sermon so you can worship fully present. Auto-generated sermon notes include key themes and scripture references — searchable across your faith journey. — Smart Folders & Note Sharing Create custom folders to organize voice recordings and meeting notes. Share key takeaways with teammates or classmates in one tap. — Smarter Note Review: Ask Owll AI Owll highlights main points, answers questions with built-in AI Q&A, and delivers clear summaries from transcripts, recordings, or any topic. — Real-Time Translation & Multilingual Transcription Understand any meeting, lecture, or conversation as it happens. Enable real-time translation before recording — choose your transcription language and target language — and Owll displays original and translated text side by side, live. After recording, review bilingual notes, switch between original, translation, or dual-language views, and share a bilingual transcript with your team. Supports 100+ languages. — AI Study Aid: Flashcards & Lecture Notes Convert audio into text with precise AI transcription. Smart summaries turn key points into lecture notes, study guides, and flashcards. Owll's AI quizzes create practice questions to reinforce key ideas — ideal as a note taking app or study companion. — Import, YouTube & OCR Support Import audio to text from any app or YouTube videos for instant transcripts. Use OCR to turn PDFs and images into searchable text. Why Choose Owll? Save Time: Hands-free voice recording on Apple Watch for walks, drives, or quick stand-ups. Organize Everything: All-in-one hub for meeting notes, sales leads, lecture notes, and sermon notes. Global Reach: Break language barriers — translate any recording into 100+ languages after recording. Second Brain: Every recording builds a searchable knowledge base — your memory, amplified. Subscription Plans Owll Plus offers these options: 1-Year Subscription 1-Month Subscription 1-Week Subscription Payment & Management Payments are billed to your App Store Account upon purchase. Subscriptions auto-renew unless canceled 24h before the period ends. Manage subscriptions in Account Settings. Terms & Privacy Terms of Use: https://owll.ai/user-agreement/#/terms-service/ Privacy Policy: https://owll.ai/user-agreement/#/privacy-policy/

About

GTP API Gravity Calculator2

This application calculates the corrected API gravity at 60°F for jet, gasoline, and diesel fuels. It also determines the total weight of the fuel. It's a digital replacement for physical slide calculators.

Highlights
  • Corrected API gravity calculation
  • Total fuel weight calculation
  • Supports jet, gasoline, and diesel fuels
  • Digital version of slide calculators
  • Developed in 2025
Features
Currently charting
Read full description

The GTP API Gravity Calculator v2 (Developed 2025) from Gammon Technical Products, Inc. provides users the ability to determine corrected API at 60 Deg F for jet, gasoline, and diesel fuels. The calculator is a digital version of our GTP-3012-1A and GTP-2727EF slide calculators and it also is capable of calculating the total weight of the fuel.

Screenshots

Owll4 screens
GTP API Gravity Calculator21 screens

Verdict

The call

The clearest difference is price: Owll at Free against GTP API Gravity Calculator2's $9.99. Owll also leads on rating (4.8 vs 4.0) and ratings volume (3.1K vs 1). GTP API Gravity Calculator2's advantage is in-app purchases (none vs 10) and review sentiment (100% vs 66%). On ads 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

Owll is free to download; GTP API Gravity Calculator2 costs $9.99 up front. Owll sells 10 in-app purchases, starting at $5.99 per 7 days. GTP API Gravity Calculator2 asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Owll holds the better App Store score, 4.8 against 4.0. That said, the two scores are not equally well evidenced: Owll has 3.1K ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 66% of Owll's written reviews are positive against 100% of GTP API Gravity Calculator2's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Owll ships an update fortnightly, GTP API Gravity Calculator2 every 2 months. The most recent releases landed on November 3, 2026 and October 28, 2026 respectively.

Scorecard10 real differences · 1 level
Owll versus GTP API Gravity Calculator2: the parameters behind the verdict, then further details
ParameterOwllGTP API Gravity Calculator2
PriceFree — better$9.99
Rating4.8 (3.1K ratings) — better4.0 (1 ratings)
Positive reviews66.1% of reviews100.0% of reviews — better
Number of ratings3.1K — better1
Update frequencyFortnightly — betterEvery 2 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases — betterPaid
Best chart rank#58 — better#176
DevicesiPhone, iPad, iPod, Apple Watch — betteriPhone, iPod
Requires iOS15.612.0 — better
Further details — not scored
Size124 MB9 MB
Age rating4+4+
DeveloperVOCALBEATS.AI PTE. LTD.Gammon Technical Products

Customer experience

Owll

All ratings3,083 ratings
Positive95.7%
Neutral0.8%
Negative3.5%
Written reviews345 reviews
Positive66.1%
Neutral3.2%
Negative30.7%

GTP API Gravity Calculator2

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

Owll

Reported bugs

3 issues
  • Recordings interrupted by incoming calls
  • Authentication code not received
  • Inability to transfer transcriptions

Requested features

3 requests
  • Add real-time transcription
  • Improve video recording support
  • Allow easier sharing of transcripts

GTP API Gravity Calculator2

Not enough reviews yet to summarise bugs or requests.

In-app purchases

10 purchases

Owll

Subscriptions10
  • Recorder Premium 1 Week3 Days trial$5.997 Days
  • Recorder Pro+, 1 week3 Days trial$7.997 Days
  • Call Recorder Plus, 1 week$7.997 Days
Show 7 more
  • Call Recorder Pro Access,1week7 Days trial$7.997 Days
  • Call Recorder Pro, 1 week$9.997 Days
  • Recorder Access 1 Year$69.991 Year
  • Recorder Plus Access 1 Year7 Days trial$69.991 Year
  • Recorder Plus, 1 year3 Days trial$69.991 Year
  • Recorder Plus Access, 1 year1 Year trial$79.991 Year
  • Call Recorder Pro, 1 year3 Days trial$99.991 Year
None

GTP API Gravity Calculator2

No in-app purchases

Questions

Is Owll free?
Owll is free to download, with in-app purchases available.
Is GTP API Gravity Calculator2 free?
GTP API Gravity Calculator2 costs $9.99, with no in-app purchases.
Which has better reviews, Owll or GTP API Gravity Calculator2?
Owll is rated higher. Owll averages 4.8 out of 5 from 3.1K ratings, while GTP API Gravity Calculator2 averages 4.0 from 1 ratings.
Do Owll or GTP API Gravity Calculator2 have ads?
Neither Owll nor GTP API Gravity Calculator2 shows ads.
Which is updated more often, Owll or GTP API Gravity Calculator2?
Owll ships an update fortnightly, and GTP API Gravity Calculator2 every 2 months. Most recently, Owll was updated on November 3, 2026 and GTP API Gravity Calculator2 on October 28, 2026.
Which is more popular, Owll or GTP API Gravity Calculator2?
Owll currently peaks at #58 in the App Store charts, and GTP API Gravity Calculator2 at #176. Chart position reflects recent download velocity rather than total install base.

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