<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0204</schemaVersion>

    <documentType>3/A</documentType>

    <periodOfReport>2011-06-14</periodOfReport>

    <dateOfOriginalSubmission>2011-06-16</dateOfOriginalSubmission>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000820738</issuerCik>
        <issuerName>TigerLogic CORP</issuerName>
        <issuerTradingSymbol>TIGR</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001449487</rptOwnerCik>
            <rptOwnerName>Torng Cliff</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>25A TECHNOLOGY DR, STE 100</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>IRVINE</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>92618</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>VP Marketing</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable></nonDerivativeTable>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Stock Option (Right to Buy)</value>
                <footnoteId id="F1"/>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>4.10</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2011-09-23</value>
            </exerciseDate>
            <expirationDate>
                <value>2021-03-23</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>20000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The original Form 3 inadvertently omitted an option granted on March 23, 2011 for consulting services provided by Mr. Torng prior to his appointment as TigerLogic's Vice President of Marketing on June 16, 2011. Shares vest 50% after six months and one-twelfth (1/12th) monthly thereafter, with 100% vesting on March 23, 2012, based on Mr. Torng's continued service to TigerLogic.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Cliff Torng</signatureName>
        <signatureDate>2012-01-17</signatureDate>
    </ownerSignature>
</ownershipDocument>
