Comparison

Gradescope vs Codon

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

Head to head
About

Gradescope

Easily upload assignments for courses using this app. Submit files from your device or scan your work directly. Assign pages for variable-length assignments and resubmit if needed before the deadline.

Highlights
  • Upload assignments
  • Scan documents with camera
  • Select existing files
  • Assign pages for variable-length assignments
  • Resubmit assignments
  • View submitted and graded assignments
Features
Currently charting
Read full description

Students, upload your assignments to Gradescope more easily than ever before! If your instructor uses Gradescope for your assignments, you can now upload your submission with our mobile app. After installing and opening the app, login to see your Gradescope courses and assignments. To upload a submission, click on the assignment in the “Not Submitted” tab and either “Select File” to select an existing file from your device or “Scan” all pages of your completed work using your iPhone’s camera. Once you submit your file(s), for templated assignments, you’re all set. For variable-length assignments, “Assign pages” to indicate where your answer for each question appears within your submission. It’s that easy! After confirming, your assignment then moves to the “Submitted” tab. If needed, you can resubmit your assignment until the due date your instructor set has passed. Once it is graded and grades are published for the assignment, it then moves to the “Graded” tab. Note: For V1 of the app, you will be directed to our mobile website for any advanced functionality, including viewing feedback and submitting timed, programming, or online assignments. Stay tuned for future updates that will allow you to do even more with our mobile app!

About

Codon

Master biology from molecules to ecosystems with a comprehensive, offline curriculum. Explore 100 lessons, researcher profiles, and landmark experiments. Learn mechanisms and track progress with spaced repetition and interactive quizzes.

Highlights
  • Offline biology curriculum
  • 100 lessons with narration
  • Researcher profiles
  • Interactive quizzes with explanations
  • Spaced repetition learning
  • Offline access, no account needed
  • Home screen widgets
Features
Read full description

A four-year biology curriculum, offline, with no account and no network. Codon covers what an introductory sequence and the first two years of a degree teach: molecules and cells first, then inheritance and molecular biology, then evolution, diversity and ecology, then whole organisms and physiology. WHAT IS INSIDE 100 lessons across four years, each 15 to 25 minutes, with on-device narration 60 researcher profiles, from Mendel and Darwin to McClintock and Doudna 735 glossary terms, cross-linked to the lessons that use them 20 quizzes with worked explanations for every answer 18 landmark experiments reconstructed: Meselson and Stahl, Hershey and Chase, Luria and Delbruck Spaced repetition that schedules the terms you keep forgetting Bookmarks and notes on any lesson, profile or term Three Home Screen widgets: a quote, a term and a figure, each changing daily HOW IT TEACHES The course teaches mechanisms rather than vocabulary. Where a textbook says respiration yields 38 ATP, this one gives the real figure of roughly 30 to 32 and explains why the number moved. Where the field is unsettled, such as the origin of eukaryotes or the tempo of speciation, the lesson gives the competing accounts and who holds them. FREE AND PAID The first ten lessons are free. One purchase of $9.99 unlocks the remaining 90 and everything else, permanently. There is no subscription, there are no ads, and there is no account to create. Family Sharing is supported. OFFLINE BY DESIGN The app makes no network connections. Every lesson, profile, glossary entry, quiz and case study is bundled in the download, so the whole course works in airplane mode. Nothing you read or write here leaves your device.

Screenshots

Gradescope4 screens
Codon3 screens

Verdict

The call

The clearest difference is rating: Codon at 5.0 against Gradescope's 1.4. Codon also leads on update cadence (every 10 days vs every 2 months). Gradescope's advantage is in-app purchases (none vs 1) and ratings volume (259 vs 1). On price, ads 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. Codon sells 1 one-off in-app purchase. Gradescope asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Codon holds the better App Store score, 5.0 against 1.4. That said, the two scores are not equally well evidenced: Gradescope has 259 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

Gradescope ships an update every 2 months, Codon every 10 days. The most recent releases landed on September 30, 2026 and September 22, 2026 respectively.

Scorecard7 real differences · 4 level
Gradescope versus Codon: the parameters behind the verdict, then further details
ParameterGradescopeCodon
PriceFreeFree
Rating1.4 (259 ratings)5.0 (1 ratings) — better
Positive reviews9.1% of reviews—
Number of ratings259 — better1
Update frequencyEvery 2 monthsEvery 10 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
Best chart rank#85 — better—
DevicesiPhone, iPodiPhone, iPad
Requires iOS13.4 — better17.0
Further details — not scored
Size37 MB5 MB
Age rating4+12+
DeveloperTurnitinOMAR DANIEL GRAZIANO

Customer experience

Gradescope

All ratings259 ratings
Positive7.3%
Neutral3.5%
Negative89.2%
Written reviews99 reviews
Positive9.1%
Neutral7.1%
Negative83.8%

Codon

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

Gradescope

Reported bugs

3 issues
  • Camera flash issues during scanning
  • Photos not uploading in correct order
  • Inconsistent download button behavior

Requested features

3 requests
  • Ability to sort assignments by due date
  • Integration of tools for instructors
  • Improved iPad and tablet optimization

Codon

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Gradescope

No in-app purchases

1 purchases

Codon

One-time1
  • Codon Full Access$9.99

Questions

Is Gradescope free?
Gradescope is free to download, with no in-app purchases.
Is Codon free?
Codon is free to download, with in-app purchases available.
Which has better reviews, Gradescope or Codon?
Codon is rated higher. Gradescope averages 1.4 out of 5 from 259 ratings, while Codon averages 5.0 from 1 ratings.
Do Gradescope or Codon have ads?
Neither Gradescope nor Codon shows ads.
Which is updated more often, Gradescope or Codon?
Gradescope ships an update every 2 months, and Codon every 10 days. Most recently, Gradescope was updated on September 30, 2026 and Codon on September 22, 2026.

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