KNOWBODY vs Simple Power Grader
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
KNOWBODY
This app provides sexual education resources for secondary schools, suitable for all German states from 6th grade. Teachers and interested individuals can test it for free for 8 days.
- Sexual education content
- Suitable for secondary schools (6th grade+)
- Bundensland-independent
- Free 8-day trial for teachers
- Login with Univention (Bremen)
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KNOWBODY ist eine App für sexuelle Bildung im Schulunterricht. Eingesetzt werden kann sie bundeslandunabhängig an allen weiterführenden Schulen ab der 6. Klasse. Für Schulen und Lehrkräfte im Bundesland Bremen steht sie ab sofort kostenfrei und für den Login mit Univention zur Verfügung. Lehrkräfte und weitere interessierte Personen können die App kostenfrei 8 Tage lang testen. Bei Rückfragen zur App-Nutzung stehen wir unter mail@knowbody.app zur Verfügung.
Simple Power Grader
This app offers a simple yet powerful tool for educators to create and apply custom grading scales. It supports various international grading systems and allows for detailed customization of how scores are translated into grades, ensuring fair and transparent evaluation.
- Customizable grading scales
- Supports international grading systems
- Option to count half points
- Error grading scale option
- Multiple output formats for grades
- Save and export grading scales (Pro)
- Data protection focused
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The Teachers' Friend (aka Der Lehrerfreund) grading scale is considered the standard for assigning grades worldwide. Advantages: → absolutely simple handling → fair, transparent grading → individual setting options (depending e.g. on the level of demand of your class work). 100% data protection - as no data is passed on Especially as a teacher or educator, you have to pay close attention to what happens with your own data. No problem with the Lehrerfreund grading scale calculator: all data remains on your smartphone, even in the Pro version. Reliable and competent calculation calculators - for over 10 years! In the last 10 years, the Teachers' Friend grading scale calculators have been used millions of times on the internet. We are constantly updating and optimizing the calculation logic - there is probably hardly anyone who has deeper knowledge about grading scales than we have. The grading scale app takes this established system to the next level: → Numerous setting options. Although the operation is conceivably simple (enter maximum score and tap CALCULATE button), there are numerous setting and customisation options, e.g: - Count half points or half correct answers - Grading scale for questions - Errors grading scale (e.g. for vocabulary tests) - Output as whole, half, third, quarter, tenth grades - Different grading scales (USA a.o.: A-F or A+/A/A- to F, custom scales can be set, e.g. 100-0, Germany 1-6, Germany upper level 15-0, Switzerland 6-1, Austria 1-5). - Different calculation logics - Classical grading scale (linear distribution) - New also with kink - grade scale (pass mark in %) - Base key (defined minimum/maximum limits) - K1/K2 (German KMK standard, takes into account deviation in some German provinces) - German CCI/IHK grading scale → Pro functions (after expiry of the trial version with 10 free calculations): By subscribing a yearly or half-yearly plan, you gain access to further valuable functions: - Saving your grading scales with name and remark ("Dictation class 8b - difficult") - So you can access the same grading scales several times or have your grading scales immediately at hand in discussions with students and parents. - Export your grading scales as PDF - to share, print, archive - Export your grading scales as CSV for Excel or similar for further processing in Excel or in pupil/class administration apps. - You support the continuous development and improvement of the Teachers' Friend grading scale calculator. Terms of use (EULA): https://www.apple.com/legal
Screenshots
Verdict
The clearest difference is update cadence: KNOWBODY at every 3 weeks against Simple Power Grader's every 2 months. KNOWBODY also leads on review sentiment (67% vs 56%) and iOS requirement (13.0 vs 15.0). On price, ads, in-app purchases and monetization model 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
Both are free to download. KNOWBODY sells 1 one-off in-app purchase and Simple Power Grader sells 2 in-app purchases, starting at $2.49 per 6 months. Whichever you choose, the download price is not the number that matters.
KNOWBODY ships an update every 3 weeks, Simple Power Grader every 2 months. The most recent releases landed on October 4, 2026 and September 22, 2026 respectively.
| Parameter | KNOWBODY | Simple Power Grader |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 66.7% of reviews — better | 55.6% of reviews |
| Update frequency | Every 3 weeks — better | Every 2 months |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 132 MB | 79 MB |
| Age rating | 12+ | 4+ |
| Developer | Knowbody UG (haftungsbeschraenkt) | Lehrerfreund GmbH |
Customer experience
KNOWBODY
Simple Power Grader
In-app purchases
KNOWBODY
- Familienlizenz$12.99
Simple Power Grader
- Pro Abonnement (6 Monate)$2.496 Months
- Pro Abonnement (1 Jahr)$4.491 Year
Questions
Is KNOWBODY free?
Is Simple Power Grader free?
Do KNOWBODY or Simple Power Grader have ads?
Which is updated more often, KNOWBODY or Simple Power Grader?
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