AudioStrip vs CoGrader
Side-by-side comparison · Updated October 2026
| Description | AudioStrip is a web service for separating vocals and instrumentals with trained AI, reducing noise in speech, and mastering recordings. It also offers key and BPM detection. It is a useful option to compare when preparing a practice track, checking a mix or extracting material you have permission to reuse. Source separation can leave vocal remnants and other artifacts; the useful test is how the output sounds in your project, not whether a marketing example sounds clean. Its free pricing table lists three isolations, three masters and three enhancements per month. Free uploads are limited to 50 MB and eight minutes, with MP3 output. There is a discrepancy to check: the FAQ still says five free extractions per month. Budget for the pricing table's lower allowance and confirm the current quota in the service before planning a larger job. The FAQ lists WAV, MP3, OGG, M4A, WMA and FLAC inputs, and recommends starting from a good-quality WAV or FLAC source when available. The Premium pricing card currently displays £5.99 per month as a 25% offer against £7.99. It advertises unlimited isolations, masters and enhancements, batch uploads, files emailed to you, and WAV, FLAC or MP3 output. Limits rise to 200 MB and 20 minutes per upload. Confirm the price charged at checkout and on renewal: this listing reports a promotional display, not a tested purchase or a guaranteed permanent rate. The site advertises a 15-day Premium trial; the terms restrict trials to first-time Premium customers. For a small evaluation, choose a recording you are authorized to process and decide which part you need to keep. Use isolation for vocals and backing music, enhancement for speech noise, or mastering for a finished mix. Listen for voice remnants, watery or metallic textures, missing transients and unwanted changes to the instruments. Keep the original file and judge the result both alone and in the intended mix. Paying for more output formats or faster processing does not guarantee that every song will separate well. AudioStrip's free 15–60 minute estimate and Premium speed claims are vendor estimates, not measurements from this review. Compared with AudioAlter, AudioStrip focuses on learned separation and offers a paid batch workflow. AudioAlter provides individual effects, conversion and analysis tools, with OOPS stereo subtraction for vocal reduction. The methods solve overlapping but different problems. Neither processing method grants rights to recordings or musical compositions you do not own. AudioStrip Ltd is the operator named in the terms, which set an 18+ service requirement. The terms say the company does not claim ownership of input or output recordings and will not use input recordings to train or improve AI or machine-learning models. Those are provider policy statements, not an independent audit. Its privacy policy separately describes account, analytics and cookie data; no fixed audio-file deletion deadline is confirmed here. Premium renews monthly unless canceled, and the terms say access ends on unsubscribe. Check the cancellation and trial conditions before starting, especially if you only need one batch. | CoGrader is a teacher-facing AI grading assistant for essays and other open-ended assignments. It uses a selected or custom rubric to draft grades and feedback that educators can review and edit before returning work. Its useful role is helping a teacher organize assessment and feedback; it does not establish that a grade is correct, unbiased or suitable for a particular student without human review. The free Starter plan includes 100 student submissions per month and rubric creation and sharing. The pricing page also advertises 90 days of premium access, which is a temporary benefit rather than unlimited free access to paid features. Standard includes 350 submissions per month, handwritten assignments, grammar checking and a class-performance dashboard. It costs $19 per month on monthly billing or an advertised $15 per month billed annually. The annual equivalent is $180 before any applicable additions, calculated as $15 multiplied by 12; confirm the actual checkout total before paying. Schools and Districts plans use a custom quote and advertise unlimited submissions, shared rubric libraries, administration, institutional analytics and training. Higher Ed and Enterprise also use a custom quote, with API access, custom LMS connections and roles among the listed options. Choose a plan around submission volume, the review process and the integrations your institution actually needs, rather than assuming an individual subscription includes enterprise access. To evaluate CoGrader, begin with a rubric that defines each criterion and the evidence needed for each score. Try a small, permitted sample of work you have already assessed, compare the suggested results with your own reasoning, and revise unclear rubric language. Check whether each comment refers accurately to the student's work and gives an actionable next step. Review accommodations, language-learning needs and subject-specific expectations before finalizing feedback. A class dashboard can help identify topics to revisit; it should not replace the teacher's judgment about individual learning needs. Google Classroom integration is described as available to all users. The pricing FAQ places full Canvas and Schoology integration in school or district subscriptions, although the plan cards also display those platforms elsewhere. Confirm the exact integration and account entitlement you need. Other LMS workflows may use file import and export. The vendor also advertises plagiarism and AI-writing detection, but its plan card and FAQ disagree about AI-detection access. Confirm the selected plan's access, and treat a flag as a reason to review the evidence rather than proof of misconduct. CoGrader's privacy policy says teachers provide assignment questions, rubrics and student answers, and that student grading data is not used to train its AI models. It says third-party AI providers may not train on that data and identifies OpenAI OpCo, LLC as a provider receiving anonymized grading information. The policy also allows anonymized aggregate information to improve the service and does not give one fixed deletion deadline. Follow your school's authorization and data-handling process before uploading student work; a vendor policy is a statement of practice, not an independent security assessment. CoGrader is most relevant when an educator needs rubric-based feedback at a recurring classroom workload. Compare EssayGrader using the same sample rubric, feedback-review steps, submission allowance and data requirements. The terms describe a refund window within 14 days of an initial subscription purchase; that is separate from the free plan's advertised premium-access period. Review billing and cancellation terms before subscribing. |
| Category | Audio Editing | Education |
| Rating | No reviews | No reviews |
| Pricing | Freemium | Freemium |
| Starting Price | Free | Free |
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| Tags | AI source separationvocal isolationinstrumental tracksspeech denoisingaudio mastering | AI essay gradingrubric feedbackteacher assessmentGoogle Classroomeducation |
| Features | ||
| AI vocal and instrumental separation | ||
| Speech noise reduction and audio enhancement | ||
| AI mastering for recordings | ||
| Key and BPM detection | ||
| Limited free monthly isolation, mastering and enhancement | ||
| Premium batch uploads and emailed files | ||
| MP3 output free; WAV, FLAC and MP3 on Premium | ||
| 50 MB / 8 minute free uploads; 200 MB / 20 minute Premium uploads | ||
| Rubric-based AI grades and feedback for teacher review | ||
| Free Starter: 100 student submissions per month | ||
| Standard: 350 submissions per month | ||
| Custom and standards-aligned rubrics | ||
| Handwritten assignments and grammar checking on Standard | ||
| Google Classroom integration and institutional LMS options | ||
| Class-performance dashboard and institutional analytics | ||
| Quoted API access for Higher Ed and Enterprise | ||
| View AudioStrip | View CoGrader | |
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