A grade before you post is useful exactly once. You fix what it flagged, re-export, grade again, and now you are holding two reports that do not know about each other. Whether the fix worked is left for you to work out by eye.

That gap is one of the most common reasons creators start looking at PreAlgo alternatives. This page compares six real options on that single question: when you revise a draft, does the tool compare the new version with the old one, or start from zero? Some of them are genuinely free to start, and we say which. We build one of them, so treat our description as interested and every fact as checkable. Every competitor fact below comes from that vendor’s own public pages, read on 26 September 2026. Prices move, so check before you buy.

What PreAlgo does well

Credit first. We read PreAlgo’s own site today. It grades a video before you publish it, for TikTok, Instagram Reels and YouTube Shorts. It advertises a retention forecast with the moments viewers are likely to drop, checks on hook strength, pacing and call to action, and “specific fixes, not vague advice”, with an analysis finished in under two minutes.

The pricing is some of the friendliest in the category. The free plan gives one full analysis a month with no card. Creator is $9.99 a month for 15 analyses, Pro $24.99 for 50, and Agency $79.99 for 200.

What its pages do not advertise is an analysis history, a way to re-grade a revised draft as a new version of the same video, or any comparison between two grades. That is a scope choice, and for a creator who grades one finished draft and posts it, it may not matter at all. We compared the two tools on other axes before: a filterable library against one score per draft in our PreAlgo alternative, and what happens after the grade in Blossom vs PreAlgo. This page is about the second draft.

Why the second draft is where the learning happens

The loop most creators actually run is: film, get feedback, re-cut, check again, post. A pre-post grade is built for the feedback step. At the re-cut, most tools go quiet.

Run that loop on two standalone reports and it gets murky quickly. Version one loses points on the opening. You tighten the opening, and version two scores higher. Was it the new hook? Or did the re-cut also change the length and the pacing, so the second report is reading a different video? Two unconnected reports cannot tell you.

The harder problem is regressions. Every fix costs something. Cutting the setup to reach the point sooner can leave the payoff without enough context to land. When nothing remembers version one, a regression shows up as a brand new complaint instead of the price of your last fix. We made the full case in Blossom vs Leen Studio and again in our TransClipper alternatives roundup.

So of every tool below, we asked three things:

Can I check a draft before it is public?
Does it keep a record of what it said about earlier versions?
Does the next check compare against the last one, or start fresh?

One caveat covers every tool here, ours included. A grade reads the content. It does not know your future views, and no tool can promise a video will travel. Our reasoning is in no tool can guarantee a viral video.

1. Blossom, for knowing whether version two beat version one

This is ours. Blossom analyzes any public Instagram Reel or TikTok, or a draft you upload before posting. To ground this section in the product as it runs today rather than in memory, we opened a video from our library through Blossom’s own AI-client connection on 26 September 2026: a 12-second recipe TikTok with close to 800,000 views, built on a finished-dish opening, fast cuts and close-ups of the food. Leaving out the creator, the caption and the video itself, here is what the breakdown held:

A named format and hook. The video classed as a Recipe Demo with a question-style hook, and the promise (a quick, good-looking recipe) marked as clear and delivered.
Seven named techniques, each with a timestamp range, a plain explanation of why it works, and a rating for how well this video executed it.
The timing. Hook, setup and payoff laid out in seconds, with the payoff taking most of the runtime.
One named weakness with a fix. No ingredient quantities anywhere, which makes the recipe hard to repeat, and the fix is to put them on screen or in the caption.

That list of weaknesses is what versioning works from. Upload a draft and analyze it, then upload the re-cut as a new version of the same piece of content. The second analysis is not standalone. It is compared against the first, and it reports how the scores moved, which earlier weaknesses you addressed, which you only partly addressed, which are still open, and whether the edit introduced a regression.

Picture that recipe video as your own draft (this part is illustrative, not a run we did). You add the quantities the first analysis asked for. A fresh standalone report would hand you a new list to compare by eye. The version pass tells you the missing quantities are resolved, and flags it if the new text crowds the close-ups that were carrying the video. That is one specific lesson about your own edit, not a second opinion from scratch.

Now the honest part, and against PreAlgo in particular it matters:

No free tier. Creator, Pro and Agency start with a 7-day trial that asks for a card, and Starter is billed from day one. PreAlgo gives you one analysis a month for nothing.
Versioning is not on every plan. Starter is $9.99 a month for 10 analyses and Creator $39 for 50, but version comparison starts at Pro, $99 a month for 250 analyses, and continues on Agency. If versioning is the reason you would switch, that is the real price.
No YouTube Shorts. We cover Instagram and TikTok only. PreAlgo covers Shorts too.
Scripts, not footage. We write scripts from videos that already worked in your niche. We do not generate video.

2. TikAlyzer, the cheapest analysis history

TikAlyzer is built for your own drafts. Its site today describes a viral score from 0 to 100, hook and retention analysis, and “the exact second viewers swipe”, across TikTok, Instagram Reels and YouTube Shorts.

Pricing: Pro at $9.99 a month (unlimited analysis, hook strength, basic retention insights), Growth at $19.99 (adds drop-off analysis, export and “Video library & history”), and Creator at $49.99 (unlimited accounts, team collaboration, bulk analysis). There is no free plan, but every tier carries a 7-day money-back guarantee.

Growth is the closest thing to what this page is about at a low price: your past analyses are kept and you can go back to them. What the page does not advertise is an analysis that compares a new cut with the old one and tells you which fixes landed. If a history you read yourself is enough, it is the budget pick.

3. Viralo, the most generous free plan

Viralo scores videos on many signals and has a separate pre-publish review for drafts. Its pricing page today lists a free plan with no card (2 video analyses a month and 1 full detailed breakdown), Creator at $9 a month (30 analyses, 10 pre-publish reviews, 10 scripts, 3 feed channels), Pro at $22 (100 analyses, 50 reviews) and Agency at $59 (500 analyses, 200 reviews), all with a 7-day money-back guarantee.

Every plan lists “Script export + history”. That is history for scripts; the page does not advertise comparing one analysis of a video with the next. If you want more free checks than PreAlgo gives, and a cheap paid step after that, Viralo is the strongest option on price.

4. Leen Studio, for Instagram creators who want a trial without a card

Leen Studio is Instagram-focused. Its site today says you can “analyze a file before publishing to fix it, or a link after posting to learn from it”, and it advertises a channel memory that “builds a model of your channel over time” from your content style and top-performing patterns.

Pricing: Starter $15 a month (10 analyses, hook scoring, trend timing), Pro $49 (50 analyses, AI chat on every report, channel memory, 3 competitor tracks) and Agency $199 (200 analyses, 5 seats, 10 channels). Every plan starts with 7 days free and no card.

Channel memory is a real step beyond a one-off grade, because later reports know something about your account. What the pages do not advertise is re-analyzing a revised draft as a version of the same video, or a comparison between the two. If you post only on Instagram and want to try before paying anything, it is a sensible pick.

5. CreatorScope, for a one-off audit with no subscription

CreatorScope works from your handle rather than a draft. Its site today says you “drop your @” with no login and no connected accounts, and it returns per-reel ratings for hook, retention and engagement, predicted drop-offs, content patterns and growth suggestions across Instagram Reels and TikTok.

It is priced as one-time purchases, not a subscription: €2.49 for a single video, €8.49 for up to 10, and €21.49 for up to 50. Reports are one-off deliverables; saved reports or comparisons between versions are not advertised.

If what you liked about PreAlgo was paying almost nothing for a clear read, CreatorScope is the cheapest way to get a deep look at posts you have already published. It is not built for iterating on an unpublished draft.

6. Vervox, for analysis bundled with creation tools

Vervox pairs video analysis with script, carousel and idea generation. Its pricing page today lists Creator at $23 a month (80 creation credits, 50 video analyses), Pro at $47 (250 credits, 100 analyses) and Business at $99 (550 credits, 250 analyses), with up to 41% off yearly and no free tier listed.

It gives you more analyses per dollar than most tools here once you are paying, plus creation tools in the same subscription. Saved analysis history and comparisons between versions are not mentioned on the pricing page, so check the product before buying if iteration is the reason you are switching.

At a glance

Tool	From	Free option	Platforms	Compares a revised draft with the last one
PreAlgo	$9.99/mo	1 analysis/mo, no card	TikTok, Reels, Shorts	Not advertised
Blossom	$9.99/mo	None, trial needs a card	IG, TikTok	Yes, from Pro ($99/mo)
TikAlyzer	$9.99/mo	None, 7-day money-back	TikTok, Reels, Shorts	History on Growth, comparison not advertised
Viralo	$9/mo	2 analyses/mo, no card	Shorts, TikTok, Reels	Script history, analysis comparison not advertised
Leen Studio	$15/mo	7-day trial, no card	Instagram	Channel memory, version comparison not advertised
CreatorScope	€2.49 one-time	None, pay per report	IG, TikTok	Not advertised
Vervox	$23/mo	None listed	Several networks	Not advertised

Look at the rows we lose. PreAlgo and Viralo let you start free, Leen Studio lets you try without a card, and three tools here cover YouTube Shorts, which we do not. The feature this page is about sits on our $99 plan, not our $9.99 one. If your budget this month is nothing, or Shorts is your main platform, those are the honest answers and we are not.

Picking by what you actually do

You grade one finished draft a month and post it. Stay on PreAlgo’s free plan. Nothing here beats free for that job.
You want more free checks, and a cheap paid tier after. Viralo.
You want your past analyses kept for under $20 a month. TikAlyzer Growth.
You post only on Instagram and want to try without a card. Leen Studio.
You want a deep read on posts already live, with no subscription. CreatorScope.
You want analysis and creation tools in one paid bundle. Vervox.
You re-cut the same video two or three times before it ships and want to know, each time, which fix worked and what it cost you. That is the case we make for ourselves.

Can you use PreAlgo and Blossom together?

Yes. Some creators will keep PreAlgo’s free monthly grade as a quick outside check, especially for YouTube Shorts, which we do not cover. Blossom’s part is the loop around it: which format to build on, what the first cut got wrong, and whether the second cut fixed it without breaking something else.

A last honest note

A grade answers “how good is this draft”. Versioning answers “did my change make it better”. They are different questions, and most creators only notice the second one when they have re-cut a video three times and still cannot say which edit mattered. If you rarely revise, you do not need it. If you revise constantly, it is the part of the loop that turns feedback into a skill.

For the wider view of the category, including the rows where we lose, read our honest comparison of viral video analysis tools. Plan limits are in full in our FAQ.

If iteration is the question you actually have, the 7-day trial at signup is the quickest way to test it. It does ask for a card, and version comparison needs the Pro plan, so start the trial there if that is the feature you came for.

Best PreAlgo Alternatives in 2026 (Free & Paid)