Most "best stock scanner under $30" articles you find online are affiliate-fee farms. The author gets paid per signup, every product gets a 9/10 review, and the conclusion is always "they're all great, pick what suits you." If you've read more than two of them, you know the type.

This isn't that. Tapeline is one of the four scanners in this matrix and we're not going to pretend otherwise — but the comparison is structured so you can rule us out cleanly if we don't fit. The criteria are public, the rankings are explicit, and the rows where we lose are highlighted, not hidden.

The four scanners under $30/mo retail traders actually buy

"Under $30/mo" rules out the institutional tier — Bloomberg Terminal ($24K/yr), Koyfin Plus ($59/mo), Trade Ideas Premium ($188/mo), Benzinga Pro ($177/mo). Those are tools built for sell-side and prop-desk users; if you're a retail trader running one or two accounts, they're not realistic. The actual sub-$30/mo shortlist in 2026:

Finviz Elite — $24.96/mo annual ($29.96/mo monthly). The veteran. Maps + heatmaps + 70+ screener filters. Free tier is the entry point most retail traders started with.
Stock Rover Essentials — $7.99/mo annual ($9.99/mo monthly). Long-only fundamentals focus. Strong portfolio analytics, weaker on intraday data.
Zacks Premium — $20.83/mo annual ($24.95/mo monthly). Earnings + analyst-rating focus. The Zacks Rank is the core differentiator; everything else is supporting.
Tapeline Pro — $8.25/mo annual ($9.99/mo monthly). One 0-100 composite per ticker from a published six-factor methodology, with a public daily back-checked scorecard.

The matrix (data current as of 2026-05-21)

I've split the comparison into four axes that actually matter to the retail trader spending $25/mo on a scanner: feature depth, data freshness, transparency of the methodology, and — the one nobody else publishes — whether the daily picks actually beat SPY.

1. Feature depth

Finviz Elite wins on raw filter count — 70+ screening criteria, real-time data, advanced charting, custom groups. If you're the type who wants to express a thesis as a seven-condition AND-filter, it's hard to beat.

Stock Rover wins on fundamentals depth — 150+ fundamental metrics, multi-year history, portfolio tracking with allocation drift alerts. Built for the long-only quality investor.

Zacks wins on earnings + analyst ratings — the Zacks Rank is the original "stock signal" and still the reference for that style of scoring. Earnings ESP, broker rating changes, and surprise history are deeper than competitors.

Tapeline Pro ranks lower on raw filter breadth (we don't try to expose 70 filters), higher on signal density — the composite score does the synthesis work that filter-by-filter screening makes the user do manually. Different product philosophy, not necessarily a better one for everyone.

2. Data freshness

This one's measurable. We checked the actual delay on each product's free tier:

Finviz free: 15-minute delay. Elite: real-time.
Stock Rover free: end-of-day. Essentials: 15-minute delay.
Zacks free: 20-minute delay. Premium: real-time on most exchanges.
Tapeline, every plan: prices delayed about 15 minutes, re-read for every covered stock and ETF about every 60 seconds during US market hours. Free shows the top 10 scanner rows; Pro+ shows the full universe (about 11,500 US stocks and ETFs as of 14 September 2026; this line said ~6,900 before). Updated 15 September 2026: this line used to say Free had "live scores (no delay)" and Pro+ had "~60-second freshness". Measured on 14 September 2026, the price vendor's data was about 15 minutes behind and a worker pass took 70 to 74 seconds (about 60 seconds after a fix later that day).

Tapeline gates on breadth rather than freshness — every plan reads the same delayed prices, and Free is just narrower (top 10 rows, 12 look-ups a day, unmetered for the first 24 hours), while Pro opens every row of the full universe. If you're testing the product, the public scorecard shows the real composite quality.

3. Methodology transparency

This is the criterion most retail-trader comparisons skip entirely. "How is the score calculated?" is a question every product answers with marketing copy ("proprietary algorithm", "decades of research"). The actual formula is rarely published.

Finviz: no composite score. Filters only. N/A.
Stock Rover: "Score" and "Growth Score" published as relative-to-universe percentile rankings; weights not disclosed.
Zacks: The Zacks Rank methodology is published at high level (earnings ESP + earnings surprise + broker rating changes) but the exact weights are proprietary.
Tapeline: All six factors named at /how-it-works, with the weighting ordered publicly (most on Trend and Relative Strength, least on Momentum) and each factor's contribution shown per ticker. Any change to the factor set is announced in the changelog before it ships.

4. Does it beat SPY?

This is the question that should drive the buy decision and the one nobody answers honestly. The reason: most product owners don't actually track it. The "back-tested results" in marketing materials are usually one-time historical simulations, not live forward-tracked records.

Of the four, Tapeline is the only one that publishes a permanent, append-only daily log of every top-10 pick with next-day return vs SPY at tapeline.io/scorecard. The losers stay on the page. The hit rate, median alpha, and best/worst days update automatically.

Updated 14 September 2026: the description of that log in the paragraph above was wrong. Entries are not re-ranked or deleted, but we have corrected recorded values twice, and said so: prices on 25 August 2026, and scores from 18 May to 12 June capped on 15 June 2026. No top 10 was recorded for 31 August, 2 September, 4 September or 9 September 2026.

Stock Rover and Zacks both publish historical performance for their internal ranks (Stock Rover's Premier list, Zacks #1 Strong Buy), but those use proprietary universe-construction rules that aren't easy to verify externally. Finviz doesn't claim a stock-picking record at all — it's a tool, not a signal.

When to pick which

Pick Finviz Elite if you have a specific thesis to express as a filter and want raw breadth (the most screens, the most filters).
Pick Stock Rover Essentials if you're a long-only quality investor with portfolio analytics needs and don't trade intraday.
Pick Zacks Premium if you trade earnings events and want the deepest analyst-rating + earnings-surprise data set.
Pick Tapeline Pro if you want one synthesised read on every US ticker, six named factors you can argue with, and a live track record you can audit before you trust it.

The honest pitch for Tapeline

I'm not going to tell you Tapeline replaces Finviz's filter breadth, because it doesn't. I'm not going to tell you it has Stock Rover's portfolio analytics, because it doesn't. What it does have is one read per ticker built from six named factors you can argue with one by one, and a public daily record of whether that score's top-10 picks actually beat SPY.

If that's the criterion that should drive the buy decision — and we'd argue it should — then the scorecard is the test. Read it. If the numbers don't hold up, we're not the right product for you. If they do, the 30-day Premium trial is the way to see it from the inside — a card, $0 charged today, and one click to cancel before the day-30 charge.

Best stock scanner under $30/month in 2026 (honest cost-quality breakdown).