Free AI stock apps vary from complete core products to limited trials. Prospero.ai provides its core signal offering free for US equities and ETFs, while Koyfin offers a functional workflow trial. Danelfin, TipRanks, and Magnifi provide free access with important limits.

Opes Borsa fits investors evaluating cross-asset market and signal access, with paid tiers adding the full Signal Confidence Score, AI Research, and Luna. Investors focused on a free US-equity signal framework, a limited trial, or a paid research platform may find another option more closely aligned with their use case.

This comparison is based on the features, limits, and approximate pricing described in the source article, including pricing documentation reviewed in mid-2026.

What this free versus paid comparison covers

The free versus paid question in AI investing apps is about what the free tier genuinely unlocks, what it withholds, and whether the withheld features drive analytical value. A free tier with real signal outputs and disclosed confidence levels is structurally different from a free tier that mainly provides interface access while keeping analytical content behind a paywall.

This comparison maps what each tier delivers without using return claims as the basis for an upgrade.

Criteria used

What free AI stock app tiers deliver

Free tiers in this category range from full core products to restricted trials. The main differences are the amount of coverage, the depth of signal or research access, and whether the free tier remains useful for a real watchlist.

Prospero.ai

Danelfin

TipRanks and Magnifi

Barebone AI and Koyfin

What paid AI investing tiers add

Across the category, paid upgrades typically add one or more of the following capabilities:

• Full signal confidence calibration rather than a directional state only.

• Autonomous research narratives rather than data feeds.

• An expanded coverage universe rather than a limited free watchlist.

• Real-time data rather than delayed data.

• Conversational AI access rather than read-only outputs.

Whether a paid tier fits depends on the investor's use case. An investor focused on US equities and seeking institutional-grade signal data at no cost has a different requirement from an investor seeking cross-asset coverage, confidence-calibrated signals, and a conversational analyst.

Where Opes Borsa fits and who should look elsewhere

Opes Borsa's free tier provides access to the cross-asset watchlist, the Markets view with Trend Signal states, and Sentiment Layer news classification. This allows the platform's market and signal access to be evaluated before an upgrade.

Paid tiers extend access to the full Signal Confidence Score with model-inferred targets, AI Research, and Luna. Features and pricing are updated independently of this article, so current tier details are available at opesborsa.com.

Opes Borsa fits investors who

Other options may fit investors who

Who may use only free tools

Prospero.ai's free tier provides meaningful signal data across options flow, institutional positioning, and sentiment for investors focused on US equities and ETFs. Koyfin's free tier supports workflow evaluation, while Opes Borsa's free tier provides market and signal access before an upgrade.

The key distinction is whether a free tier delivers genuine analytical output or mainly demonstrates the interface. Prospero.ai provides its core institutional signal framework free for US equities. Danelfin, TipRanks, and Magnifi provide meaningful free access with analytically useful paid upgrades. Opes Borsa provides free market and signal access, with paid tiers adding confidence calibration, AI Research, and conversational analyst access across its cross-asset coverage.

Frequently asked questions

Is a free AI stock app always just a trial?

No. Prospero.ai provides its core offering free in full, while Koyfin's free tier is functional for trialling its workflow and Danelfin's free tier is limited to three stocks.

Which free AI stock app provides institutional signals at no cost?

Prospero.ai provides ten proprietary signals covering options flow, dark pool activity, institutional positioning, and social sentiment for US equities and ETFs at no cost.

What does Opes Borsa provide for free?

Opes Borsa's free tier provides the cross-asset watchlist, Markets view with Trend Signal states, and Sentiment Layer news classification.

What does an Opes Borsa paid tier add?

Paid tiers extend access to the full Signal Confidence Score with model-inferred targets, AI Research, and Luna.

Which paid AI stock app includes analyst rankings and advanced screeners?

TipRanks includes analyst rankings and advanced screeners in its Premium subscription, which is approximately $30 per month.

Which app offers a free data-terminal workflow trial?

Koyfin offers a free tier with two custom dashboards, two watchlists, and basic financial data for trialling its workflow.

Key terms

• Free tier: The features and access available without a paid subscription.

• Paid upgrade: A subscription tier that adds capabilities or access beyond the free tier.

• Directional signal: A signal that indicates a market direction without providing the full confidence calibration.

• Signal Confidence Score: Opes Borsa's paid signal feature with model-inferred targets.

• Cross-asset coverage: Market and signal coverage across equities and other asset classes.

• AI Research: An Opes Borsa paid-tier feature providing access to its research layer.

• Conversational analyst: An AI access layer that allows interaction with investment research and analysis.